okay to clear up all confusion... i have a full exhaust on my yfz and did not have the programmer for about a week and it ran perfectly yes it was a little lean probably but the fuel injection was able to handle it my friend has a raptor 700 and put a full big gun on his bike and ran for a year with no problems at all. i personally with my experiences think that it would be perfectly fine to run without it if your looking to go just for sound. However it could make a difference on how long your machine lasts im sure it would last several years running how it will but im kind of a neat freak and would want to make sure that my quad was running perfect but i personally think that you will be fine but would recommend the programer as a precaution and as for the programmer go with power commander it provides maps for specific add ons for every quad and also alows you to adjust the fuel on the fly when your riding. very easy to install
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09 YFZ 450R
GYTR Full Exhaust
GYTR Billet Air Filter
Power Commander
13.2 GYTR High Compression Piston
Port and Polished Head
GYTR Intake and Exhaust Cams
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